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110年 - 110 國立清華大學碩士班考試入學試題_分析與環境科學研究所:分析化學#104989
> 申論題
8. (4%) Why is atomic emission more sensitive to flame instability than atomic absorption or fluorescence?
相關申論題
1. (5%) A new automated procedure for determining glucose in serum (Method A) is to be compared with the established method (Method B). Both methods are performed on serum from the sarne six patients to eliminate patient-to-patient variability. Do the following results confirm a difference in the two methods at the 95% confidence level?
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2. (5%) The analysis of a calcite sample yielded CaO percentages of 55.95, 56.00, 56.04, 56.08, and 56.23. The last value appears anomalous; should it be retained or rejected at the 95% confidence level? (To answer this question, please refer to the statistics table at the bottom of this page.)
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3. (10%) A 0.9092-g sample of a wheat flour was analyzed by the Kjeldahl method. The ammonia formed was distilled into 50.00 mL of 0.05063 M HCl; a 7.46-mL back-titration with 0.04917 M NaOH was required. Calculate the percent of protein in the flour. (Note: The nitrogen-to-protein conversion factor for cereals is 5.7)
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4. (4%) What types of species can be separated by HPLC but not by GC?
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5. (5%) Describe the working principle of quadrupole mass analyzer.
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6. (6%) How does gas-liquid chromatography work? List the variables that lead to band broadening in gas-liquid chromatography.
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7. (3%) Indicate the order in which the following compounds wound be eluted from an HPLC column containing a reversed-phase packing: acetone, dichloroethane, acetamide.
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9. (4%) Explain the working principle of the cold vapor atomic absorption spectroscopy to determine mercury.
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10. (8%) What is the purpose of an internal standard in ICP-MS? List the characteristics that are often cited as requirements for a good internal standard.
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11. (4%) Explain why molecular fluorescence often occurs at a longer wavelength than the exciting radiation.
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